Momentum car-brake.



No. 672,957. Patented Apr. 30, IBM. v T. E. McCOLLUM.

nuuzrnum cAR BRAKE.

(Application 11 ed June 25, 1900.)

(No Model.)

WiOcess e3 Zia en for UNITED STATES PATENT OFFICE.

THOMAS E. MCCOLLUM, OF TORONTO, CANADA, ASSIGNOR OF FORTY-SIX ANDTWO-THIRDS ONE-HUNDREDTH PARTS TO REMIQIUS ELMSLEY,

OF SAME PLACE.

'MOMENTU-M CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 672,957, dated April30, 1901.

Application filed June 25, 1900. Serial No. 21,531. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS E. McOoL- LUM, electrician, of the city of-Toronto, in the county of York, Province of Ontario, Canada, haveinvented certain new and useful Improvements in Momentum CarrBrakes, ofwhich the following is a specification.

My invention relates to that class of brakes in which the momentum ofthe car is depend ed upon to supply the necessary power to apply thebrake-shoes to the wheels.

My object is to devise a brake of that type which will fit into thenarrowest possible space upon the axle, which has its frictionsurfacesalways thoroughly lubricated and protected from the dust and weather,and which is put both in and out of action by positive means.

With this object in view my invention consists, essentially, in thedetails of construction hereinafter fully described and then definitelyclaimed.

Figure 1 is a sectional elevation of my im' proved brake with thefriction-disks separated. Fig. 2 is a plan View of the operatingmechanism.

In the drawings like letters of reference indicate corresponding partsin both figures.

A is the car-axle, and B a portion of the wheel. Secured to the axle soas to revolve therewith is the friction-disk O. Adjacent to this fixedfriction-disk is the loose friction.- disk D, free to revolve or slideupon the shaft. On the other side of this loose friction-disk is thesliding friction-disk E. The feather-key 0. gives this disk a drivingconnection with the shaft and at the same time permits it to be movedlongitudinally thereon. The sides of the loose friction-disk D areprovided with compressed fiber rings b. The faces of the disks 0 and Eare suitably formed to engage these fiber rings. It will also be notedthat these disks are recessed close to the shaft, so as to overlap thehub of the loose friction-diskD when the fiber rings have become worn.

F is a drum, either formed integral with the disk D or shrunk inposition thereon. The chain leading to the main brake-lever will bewound around and suitably secured to this drum.

Secured to the sides of the drum F are two rings or flanges G, forming acasing to exclude dust from the friction-surfaces of the brake. It alsoserves to form an oil-bath for the purpose of keeping the frictionalsurfaces thoroughlylubricated. This is a most important matter, asunless these surfaces have the dust excluded from them and arethoroughly oiled the wear on the fiber will be unduly great.

By forming the friction-surface entirely within the drum I secure agreat economy of space, as there is seldom more than nine inches ofspace on the axle of an electric car which may be used for the placingof the brake, and in many cases six inches only.

From the construction described it is evident that by sliding thefriction-disk E toward the disks D and O the frictional surfaces will betightly pressed together and the center disk, with its drum, caused topartake of the rotary motion of the disks 0 and E. Thus the chainleading to the main brake-lever may be wound upon the drum and thebrakes applied. The mechanism for effecting this movement I will nowdescribe.

H is a collar securely clamped on the axle.

I is a ring running in a suitable groove formed in the hub of the diskE. For the purpose of placing in position this ring may be split orformed in two parts, as indicated at a, (see Fig. 2) and suitably boltedor pinned together. As the side of the ring nearest to thefriction-surfaces is most exposed to wear I prefer to provide it withball-bearings d. Extending outwardly from this ring I are integralprojections or pins J. As shown, the split 0 in the ring passes throughor between these projections or pins, though of course the divisionmight be made at another point.

K is a sleeve surrounding the ring I and abutting against the collar H.It is also preferably flanged, as shown at e, to bear upon the axle A.In this sleeve are out two diagonal slots f, through which extend thepins J.

It is evident that by rocking the projections or pins J in the directionindicated by arrow n. in

in Fig. 2 and by rotating the sleeve K in the opposite direction thering I will be moved to force the friction-disks in contact with oneanother. By reversing the movement the disk E will be withdrawn and thefriction surfaces disengaged.

The bearing-surface, against which the sleeve K acts in withdrawing thedisk, as indicated, is the end of the feather-key a, though of courseother means might be provided for the purpose.

For the purpose of rocking the pins and sleeve as described I providethe latter with an arm L and the former with the forked arm M, the endsof the forks being suitably connected with the projections 01' pins J.

I do not show any means of operating these arms, as it may be done in agreat variety of ways, the important features of my diskmoving mechanismlying in the fact that no portion of it is connected with the truck andthat I secure a positive action for the withdrawal of the friction-disksas well as for forcing them into contact.

The above description will show that I have attained the threefoldobject of my invention-via, to construct a brake occupying a space onthe axle of very small width, of constructing a brake in which thefriction-surfaces are thoroughly protected from dust and weather andconstantly lubricated, and to construct a brake which is both put in andout of action by positive means.

What I claim as my invention is- 1. In a momentum-brake the combinationof a friction-disk loose on the axle; africtiondisk fast on the axle atone side of the loose friction-disk; a friction-disk slidable on afeather-key at the other side of the said friction-disk; a drum securedto the periphery of the said loose disk and overlapping the twootherdisks to exclude dust and economize space; and positive means formoving the sliding friction-disk toward the two former, substantially asand for the purpose specified.

2. In a momentum-brake the combination of a friction-disk loose on theaxle; a drum secured to the periphery of the said disk; a friction-diskfast on the axle at one side of the loose friction-disk; a friction-diskslidable on a feather-key at the other side of the said friction-disk;and means for positively moving the sliding friction-disk toward, andaway from, the two former, substantially as and for the purposespecified.

3. In a momentum-brake the combination of a friction-disk loose on. theaxle; a frictiondisk fast on the axle atone side of the loosefriction-disk; a friction-disk slidable on a feather-key at the otherside of the said friction-disk; a drum secured to the periphery of theloose friction-disk and overlapping the diagonal slots cut therein;means connected' with the axle for holding the said sleeve from endwisemotion; pins on the said ring projecting through the said slots; andmeans for rotating the ring and sleeve, substantially as and for thepurpose specified.

5. In a momentum-brake the combination with the slid-able friction-diskthereof, of a ring running in a groove in the hub thereof; a sleeveembracing the said ring and having diagonal slots cut therein; meansconnected with the axle for holding the said sleeve from endwise motionaway from the said frictiondisk; pins on the said ring projectingthrough the said slots; and means for rotating the ring and sleeve,substantially as and for the purpose specified.

6. In a momentum-brake the combination of a friction-disk loose on theaxle; a drum secured to the periphery of the said disk; a friction-diskfast on the axle at one side of the loose friction-disk; a friction-diskslidable on a feather-key at the other side of the said friction-disk; aring running in a groove in the hub thereof; a sleeve embracing the saidring and having diagonal slots cut therein; means connected with theaxle for holding the said sleeve from endwise motion; pins on the saidring projecting through the said slots; and means for rotating the ringand sleeve, substantially as and for the purpose specified.

7. In a momentum-brake the combination of a friction-disk loose on theaxle; a drum secured to the periphery of the said disk; a friction-diskfast on the axle at one side of the loose frictiondisk; a friction -diskslidable on a feather-key at the other side of the said friction-disk; aring running in a groove in the hub thereof; a sleeve embracing the saidring and having diagonal slots cut therein; means connected with theaxle for holding the said sleeve from endwise motion away from the saidfriction-disk; pins on the said ring projecting through the said slots;and means for rotating the ring and sleeve, substantially as and for thepurpose specified.

Toronto, Canada, June 16, 1900.

THOMAS E. MOOOLLUM.

In presence of J. EDW. MAYBEE, JOHN G. RIDoU'r.

